Basis of Presentation and Summary of Significant Accounting Policies (Summary of Allowance Activity Included in Trade Receivables Includes Allowance for Doubtful Accounts, Prompt Pay Cash Discounts and Chargebacks) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward}
Balance at beginning of period	$ 11,479	$ 8,888	$ 3,895
Provision related to current period sales			20,734
Credit or payments made during the period	(28,055)	(29,256)	(15,741)
Provision related to current period sales	25,157	31,315
Provision related to prior period sales	(95)	(532)
Balance at end of period	8,486	11,479	8,888
Chargebacks
Allowance for Doubtful Accounts Receivable [Roll Forward}
Balance at beginning of period	346	927	468
Provision related to current period sales			2,637
Credit or payments made during the period	(852)	(3,268)	(2,178)
Provision related to current period sales	783	2,687
Provision related to prior period sales	0	0
Balance at end of period	277	346	927
Government Rebates
Allowance for Doubtful Accounts Receivable [Roll Forward}
Balance at beginning of period	11,133	7,961	3,427
Provision related to current period sales			18,097
Credit or payments made during the period	(27,203)	(25,988)	(13,563)
Provision related to current period sales	24,374	28,628
Provision related to prior period sales	(95)	(532)
Balance at end of period	$ 8,209	$ 11,133	$ 7,961